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package util;

/**
 *
 * @author WangShuai
 */
public class MoneyUtil {

    public static String[] traditionalChineseDigits = new String[] { "零", "壹", "贰", "叁", "肆", "伍", "陆", "柒", "捌", "玖"};

    public static String[] simpleChineseDigits = new String[] { "零", "一", "二", "三", "四", "五", "六", "七", "八", "九"};

    public static String[] traditionalChineseUnits = new String[] {"", "拾", "佰", "仟"};

    public static String[] simpleChineseUnits = new String[] {"", "十", "百", "千"};

    public static String[] chineseDigits = simpleChineseDigits;

    public static String[] units = simpleChineseUnits;

    public static void setTranslateType(boolean simple) {
        if(simple) {
            chineseDigits = simpleChineseDigits;
            units = simpleChineseUnits;
        } else {
             chineseDigits = traditionalChineseDigits;
            units = traditionalChineseUnits;
        }
    }

    /**
     * 把金额转换为汉字表示的数量，小数点后四舍五入保留两位,最大数量级：十万亿
     * @param amount
     * @return
     */
    public static String amountToChinese(double amount) {

        if(amount > 99999999999999.99 || amount < -99999999999999.99) {
            throw new IllegalArgumentException("参数值超出允许范围 (-99999999999999.99 ～ 99999999999999.99)！");
        }
        boolean negative = false;
        if(amount < 0) {
            negative = true;
            amount = amount * (-1);
        }
        //小数点后四舍五入保留两位
        long temp = Math.round(amount * 100);
        int numFen = (int)(temp % 10); // 分
        temp = temp / 10;
        int numJiao = (int)(temp % 10); //角
        temp = temp / 10;
        //temp 目前是金额的整数部分
        //分割金钱字符串，每四位一组
        int[] parts = new int[20]; // 其中的元素是把原来金额整数部分分割为值在 0~9999 之间的数的各个部分
        int numParts = 0; // 记录把原来金额整数部分分割为了几个部分（每部分都在 0~9999 之间）
        for(int i=0; ; i++) {
            if(temp ==0)
                break;
            int part = (int)(temp % 10000);
            parts[i] = part;
            numParts ++;
            temp = temp / 10000;
        }

        boolean beforeWanIsZero = true; // 标志“万”下面一级是不是 0

        String chineseStr = "";
        for(int i=0; i<numParts; i++) {
            String partChinese = partTranslate(parts[i]);
            if(i % 2 == 0) {
                if("".equals(partChinese))
                    beforeWanIsZero = true;
                else
                    beforeWanIsZero = false;
            }
            if(i != 0) {
                //偶数part单位为亿
                if(i % 2 == 0)
                    chineseStr = "亿" + chineseStr;
                else {
                    if("".equals(partChinese) && !beforeWanIsZero)   // 如果“万”对应的 part 为 0，而“万”下面一级不为 0，则不加“万”，而加“零”
                        chineseStr = "零" + chineseStr;
                    else {
                        if(parts[i-1] < 1000 && parts[i-1] > 0) // 如果"万"的部分不为 0, 而"万"前面的部分小于 1000 大于 0， 则万后面应该跟“零”
                            chineseStr = "零" + chineseStr;
                        chineseStr = "万" + chineseStr;
                    }
                }
            }
            chineseStr = partChinese + chineseStr;
        }
        if("".equals(chineseStr))  // 整数部分为 0, 则表达为"零元"
            chineseStr = chineseDigits[0];
        else if(negative) // 整数部分不为 0, 并且原金额为负数
            chineseStr = "负" + chineseStr;
        chineseStr = chineseStr + "元";
        if(numFen == 0 && numJiao == 0) {
            chineseStr = chineseStr + "整";
        }
        else if(numFen == 0) { // 0 分，角数不为 0
            chineseStr = chineseStr + chineseDigits[numJiao] + "角";
        }
        else { // “分”数不为 0
            if(numJiao == 0)
                chineseStr = chineseStr + "零" + chineseDigits[numFen] + "分";
            else
                chineseStr = chineseStr + chineseDigits[numJiao] + "角" + chineseDigits[numFen] + "分";
        }
        return chineseStr;
    }


    /**
     * 把一个 0~9999 之间的整数转换为汉字的字符串，如果是 0 则返回 ""
     * @param amountPart
     * @return
     */
    public static String partTranslate(int amountPart) {
        if(amountPart < 0 || amountPart > 10000) {
            throw new IllegalArgumentException("参数必须是大于等于 0，小于 10000 的整数！");
        }
        int temp = amountPart;
        String amountStr = new Integer(amountPart).toString();
        int amountStrLength = amountStr.length();
        boolean lastIsZero = true; //在从低位往高位循环时，记录上一位数字是不是 0
        String chineseStr = "";
        for(int i=0; i<amountStrLength; i++) {
            if(temp == 0)  // 高位已无数据
                break;
            int digit = temp % 10; //取出千位、百位、十位或个位
            if(digit == 0) { // 取到的数字为 0
                if(!lastIsZero)  //前一个数字不是 0，则在当前汉字串前加“零”字;
                    chineseStr = "零" + chineseStr;
                lastIsZero = true;
            }
            else { // 取到的数字不是 0
                chineseStr = chineseDigits[digit] + units[i] + chineseStr;
                lastIsZero = false;
            }
            temp = temp / 10;
        }
        return chineseStr;
    }



    public static void main(String[] args) {
        MoneyUtil.setTranslateType(true);
        if(args.length == 0) {
            System.out.println("转换演示：");
            System.out.println("-------------------------");
//            System.out.println("10003: " + amountToChinese(10003));
               System.out.println("25000000000005.999: " + amountToChinese(25000000000005.999));
//            System.out.println("45689263.626: " + amountToChinese(45689263.626));
//            System.out.println("0.69457: " + amountToChinese(0.69457));
//            System.out.println("253.0: " + amountToChinese(253.0));
//            System.out.println("0: " + amountToChinese(0));
//            System.out.println("999: " + amountToChinese(999));
//            System.out.println("18: " + partTranslate(18));
//            System.out.println("10: " + partTranslate(10));
//            System.out.println("403: " + partTranslate(403));
//            System.out.println(Long.MAX_VALUE);
//            System.out.println(Long.MIN_VALUE);
            System.out.println("-------------------------");
        }
        else {
            System.out.println("转换结果：");
            System.out.println(args[0] + ": " + amountToChinese(Double.parseDouble(args[0])));
        }
    }

}